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Start Over Coverage 491-499

1. Factors affecting the function of the mitochondrial membrane permeability transition pore and their role in evaluation of calcium retention capacity values

Creator:
Drahota, Zdeněk, Endlicher, René, Kučera, Otto, Rychtrmoc, David, and Červinková, Zuzana
Format:
počítač and online zdroj
Type:
model:article and TEXT
Subject:
liver mitochondria, calcium retention capacity, and mitochondrial permeability transition pore
Language:
English
Description:
Values of the calcium retention capacity (CRC) of rat liver mitochondria are highly dependent on the experimental conditions used. When increasing amounts of added calcium chloride are used (1.25-10 nmol), the values of the CRC increase 3-fold. When calcium is added in 75 s intervals, the CRC values increase by 30 % compared with 150 s interval additions. CRC values are not dependent on the calcium/protein ratio in the measured sample in our experimental design. We also show that a more detailed evaluation of the fluorescence curves can provide new information about mitochondrial permeability transition pore opening after calcium is added.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

2. Photosynthetic characteristics of dipterocarp species planted on degraded sandy soils in southern Thailand

Creator:
Norisada, M. and Kojima, K.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
Acacia, carboxylation efficiency, Dipterocarpus, Hopea, irradiance-saturated photosynthetic rate, stomatal conductance, and photosynthetic capacity
Language:
Multiple languages
Description:
To elucidate whether dipterocarp species, dominant late-successional species of tropical forests in Southeast Asia, actually have a disadvantage when planted on open site in terms of their photosynthetic characteristics, we investigated photosynthesis in dipterocarp seedlings planted in the open on degraded sandy soils in southern Thailand. These species were compared with seedlings of Acacia mangium Willd., a fast-growing tropical leguminous tree, which is often planted on degraded open site in Southeast Asia. The dipterocarp seedlings had an irradiance-saturated net photosynthetic rate (PN), stomatal conductance (gs), carboxylation efficiency, and photosynthetic capacity comparable to or superior to those of A. mangium. In particular, seedlings of Dipterocarpus obtusifolius Teijsm. ex Miq. showed an irradian-ce-saturated PN of 21 µmol m-2 s-1, a value higher than any previously reported for a dipterocarp species, accompanied by high gs (0.7 mol m-2 s-1) and high photosynthetic capacity. Thus dipterocarp species do not necessarily have a disadvantage in terms of their photosynthetic characteristics on open sites with degraded sandy soils. and M. Norisada, K, Kojima.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public